Thyroid: Tc-99m-Pertechnetate

Overview

The Thyroid Nuclear Medicine Study with Tc-99m-Pertechnetate demonstrates the distribution of tissues that take up anions. Such tissues include the thyroid, salivary glands and stomach.

Indications

  • Useful in evaluation of the thyroid position, size and internal anatomy.
  • Evaluation of palpable nodules to determine if they are intra or extra thyroidal.
  • Evaluation of abnormal gland with palpation, but without definite nodules.

Study Description

A radiopharmaceutical is injected intravenously and allowed to circulate for 15 minutes. The patient is brought into the imaging room and positioned supine on the imaging table with a pillow under the mid back to hyperextend the neck. Images are taken from several projections and require 30-45 minutes. Because the position is somewhat uncomfortable, the patient is permitted to move between images.

Examination Time

  • 1 Hour

Patient Preparation

  • Ensure the patient is not pregnant or breastfeeding.
  • No contrast studies (IVP's, CT's, etc.) 4 weeks prior to exam